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It completely depends on the turbo, with my Elite Turbo Muin the loudest noise generate is my drivetrain, which is pretty quiet, i.e. I can have a normal conversation and listen to a tv at normal levels, when a friend came round to do a turbo session and bought his Tacx Vortex Smart I couldn't even hear him shouting next to me.... I'm sure @skinny once posted a video of his Lemond Revolution, which are loud enough to wake the dead...
Is a turbo trainer going to be quieter than rollers?